I estimated a parallel mixture model (C with C) and wished to related this classification with a distal binary outcome using the three-step method (Vermunt's one).

To do this I re-parameterised my 4-class by 5-class model as a 20-class model with various constraints, I then exported the modal-class assignment from this model and attempted to set up a manual 3-step model using the 19-by-20 matrix of logit constraints.

Once I had this all programmed I was met with the message that 10 categories is the limit for nominal variables.